Coil bobbin



July 15, 1941. w, sTAHL 2,249,057

BBBBBBBB IN Patented July 15, 1941 2,249,057

UNITED STATES PATENT OFFICE COIL BOBBIN William F. Stahl, Evanston, Ill. Application September 3, 1940, Serial No. 355,254

3 Claims. (01. 175-21) This invention relates to a coil bobbin, spool, in position, as shown in Fig. 3, the flange ends or the like. ll permitting the spreading thereof to insert An object of the invention is to provide a new the ends l6 of the bridge. Upon releasing the form of bobbin of improved construction and in flanges, they spring into the position shown in which the ends of the coil are supported in po- Fig. 3 in which the bridge is securely held in position away from the main body of the coil and sition. The ends of the coil are soldered or for ready attachment of electrical connections otherwise secured to the rivet members 19, as thereto. Other specific objects and advantages illustrated. will appear as the specification proceeds. in addition to supporting the coil terminals The invention is illustrated, in a preferred 10 in a position to which ready attachment can embodiment, by the accompanying drawing, in be made, the structure shown prevents unwindwhiching of the coils. Should the bridge l5 even be- Figure 1 is a perspective view of the component come dislodged, the coil ends coming from opparts of the bobbin improved in accordance with posite 'sides of the spool by reason of their enmy invention; Fig. 2, an end view of the same; 1 gagement with the rivets of the bridge member and Fig. 3, a section taken as indicated at line l5, prevent unwinding. 3 of Fig. 2 and showing the coil and the attach- The structure is extremely simple, inexpenment of the ends thereof to the terminal pieces. sive, and yet affording for the first time a sturdy In the illustration given, a core I0 is provided, support for the coil terminals when wound upon which is preferably formed of paper laminations. a core .ofthe t p described- The flanges II are identioal'in structure, each While in the foregoing specification, I have having an inwardly recessed central portion l2 set forth certain steps and, certain details of about the opening receiving the core Ill. The structure as desirable, it will be understood that upper portion of the flange II is provided with such steps and details may be varied widely by an extension l3 and with a slot 14 in the upper those skilled in the art without departing irom portion of the extension. A bridge l5 comprising the spirit of-my inven iona die cut fiber piece or a piece of other material I claim: is equipped with reduced ends it adapted to 1. In a coil bobbin of the class set forth, a be received in the slots H of the end flanges ll. core eq ipp d w th nd fl n windings about The bridge I5 is also provided with spaced aper- 3 said core, said flanges having ex n n y n tures l'l. said windings provided with aligned slots, an When the parts are assembled, as shown in insulating strip having reduced ends extending Figs. 2 and a, the core member It has its ends through said slots. a terminal p sts se u l8 swaged outwardly within the recess I: or each to said insu ati n st p, t ends of the windin s flange II. By this means, the end flanges H are being secured to s terminal Posts. securely locked against outward movement. 2. A coil bobbin oithe class set fort p Preferably, the core and flanges are coated with i a e equipped with end flan a 6011 a varnish or lacquer, waterproofing the same Wound about Said core, said flanges having l and tending also tohold the parts in assembled r yt din P n provided with align relation. The winding extends about the core, 40 s ts, a fiber strip having redu ed nds extendin but terminates below the bridge 15. The bridge through Said Slots. d v ts extending th u 15 is equipped with rivets l8 extending through- Said fiber Strip and q pp wit con ecti n the openings I1 and each provided with an upp e h end of said coil bein cure to one wardly-extending attachment lug 20 provided of said r with an opening 2|. An electrical connection A 3011 bobbin of the class Set forth. p

can be m readily with the attachment opening a core, flanges received over said core, the 3L ends of said core being swaged to lock said operation flanges therein, a coil about said core and having I two free ends, said flanges being springy in char- In operation, the assembly oi. the parts can be Rte! and having gned slots, a bridge member readily, inexpensively and securely made, The having reduced ends adapted to be received core III is brought within the openings of the within said slots when said flanges are spread flanges and the ends swaged to lock the flanges apart, and rivets secured to said bridge mem er thereon. Next, the coil is wound about the core, and each providing a connection post, each end as, illustrated in Fig. 3. Aiter the winding is of said coil being secured to one of said rivets. completed, the bridge member ll, to which the rivets I. have previously been secured, is placed W 1', arm 

